Oh, and to answer your question, the collections are stored in a file, not in the book. It's basically a text file that uses unique identifiers so that the Kindle knows what goes where. It's in the "hidden" system folder on the Kindle that you can see if you enable your computer to see protected system files and folders (for Windows, at least, don't know the function on other OSes). The file name is collections.json if you'd like to take a gander at it. It will open in Notepad or any other text editor.
Outside changes to the file require a restart before the Kindle will read the changes, which is why the solutions in my previous post will instruct you to restart.
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